Strength and ductility of innovative hybrid NSM reinforced and FRP confined short RC columns under axial compression

Chellapandian, M.; Prakash, Shamsher; Sharma, Akanshu

doi:10.1016/j.compstruct.2017.05.033

Cited by 69 publications

(24 citation statements)

References 16 publications

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“… Note : C, concentric compression, E, eccentric compression. The results of specimens under concentric compression (C) have been already reported in Reference and used here only for performance comparison.…”

Section: Resultsmentioning

confidence: 99%

“…Ten square column elements were tested under concentric compression with and without different FRP strengthening techniques. The detailed experimental program is explained in another paper of authors . Strain and displacement of the specimens were acquired by taking the average displacement value of four LVDTs attached to the surface of the column element.…”

Section: Test Setup and Instrumentation Detailsmentioning

confidence: 99%

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Experimental investigations on hybrid strengthening of short reinforced concrete column elements under eccentric compression

Chellapandian

Prakash

Sharma

2019

Structural Concrete

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This work experimentally investigates the efficacy of hybrid strengthening technique using a combination of near‐surface mounted (NSM) carbon fiber laminates and externally bonded (EB) carbon fiber‐reinforced polymer (CFRP) wraps for short reinforced concrete (RC) columns under eccentric loads. The performance of the hybrid FRP strengthened column elements was compared with the members strengthened using only NSM CFRP laminates or only EB CFRP wraps. The behavior of columns without and with different types of strengthening under concentric and eccentric compression was also compared. The tests showed that the RC column elements upgraded using hybrid strengthening displayed significant improvement in both the stiffness and strength, especially under eccentric compression. The performance improvement was primarily due to the substantial contribution of NSM laminates to the bending resistance. Existing analytical models were used to validate the observed behavior. The analytical results obtained had a close match when compared to the experimental results.

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Section: Resultsmentioning

confidence: 99%

Section: Test Setup and Instrumentation Detailsmentioning

confidence: 99%

Experimental investigations on hybrid strengthening of short reinforced concrete column elements under eccentric compression

Chellapandian

Prakash

Sharma

2019

Structural Concrete

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“…As a mature technology, FRP sheets were bonding onto the surface of RC columns to restore the ultimate load capacity due to the confinement effect [67][68][69][70][71][72][73][74][75]. Figure 6 shows the EBR procedure for RC column elements [76]. The strength-temperature curve for concrete, steel and FRP can be seen in Figure 7.…”

Section: Externally Bonded Reinforcement Strengthening (Ebr)mentioning

confidence: 99%

Repair of Fire-Damaged Reinforced Concrete Members with Axial Load: A Review

Zhou

Wang

2019

Sustainability

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It is common knowledge that structural fires have led to a great loss of buildings and damage to property in the past two decades. Therefore, there is a growing need to provide approaches for post-fire repair of structural members to enhance their structural safety. This paper presents a state-of-the-art review on the repair of fire-damaged reinforced concrete (RC) members with axial load. The investigations into the effects of loading method, physical dimension and bonding behavior on the residual strength of members are presented. In the meantime, the available experimental investigations on the performance of fire-damaged RC members with axial load repaired with concrete jacketing, steel jacketing and fiber-reinforced polymer (FRP) jacketing are summarized. Moreover, models for predicting the residual strength of fire- damaged columns are reviewed.

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“…The main reason of this failure could be the buckling of FRP when subjected to compressive loads . Therefore, a technique that has been employed to provide a lateral support for longitudinal composites in order to avoid their buckling is confining longitudinal composite sheets with continuous transverse wraps …”

Section: Introductionmentioning

confidence: 99%

RC columns longitudinally strengthened via novel EBRIOG technique

Saljoughian

Mostofinejad

2019

Structural Concrete

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Carbon fiber reinforced polymer (CFRP) composites are materials that have been acceptably used for the external reinforcement of structural load carrying elements such as reinforced concrete (RC) columns. When subjected to axial compression loads, columns longitudinally strengthened with CFRP sheets undergo buckling and debonding of their longitudinal CFRP strips as their failure modes. The present study investigates the efficiency of the new technique called "externally bonded reinforcement in/on grooves" (EBRIOG) on square RC columns strengthened with longitudinal FRP composites when subjected to cyclic axial compression loading, and examines whether EBRIOG delays the buckling and debonding of longitudinal CFRP sheets. Another aspect of the study involves investigation of the influence of the recently developed corner strip-batten (CSB) technique on confining specimens. In the CSB technique, CFRP battens used for transverse strengthening tend to stretch as entirely straight sheets like what occurs with flat coupons, as they do not tolerate any curvature. In order to compare the above-mentioned techniques and the conventional ones, 12 square column specimens (150 × 150 × 900 mm 3 ) are subjected to cyclic axial compression. The experiment parameters consist of the method used for longitudinal strengthening and the technique utilized for confining the specimens. The results exhibit improved efficiency of square RC columns (as realized by their peak load, ductility indices, energy dissipation, equivalent damping factor, secant stiffness, and average compressive stress of longitudinal composite sheets) when the EBRIOG and CSB techniques are employed simultaneously. For instance, the column strengthened through the CSB and EBRIOG method exhibits increases of 192 and 72% in its ductility and load carrying capacity, respectively, compared to those of the unstrengthened one. K E Y W O R D SCFRP, corner strip-batten (CSB), cyclic axial compression loading, externally bonded reinforcement in/on grooves (EBRIOG), RC column, strengthening

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Strength and ductility of innovative hybrid NSM reinforced and FRP confined short RC columns under axial compression

Cited by 69 publications

References 16 publications

Experimental investigations on hybrid strengthening of short reinforced concrete column elements under eccentric compression

Experimental investigations on hybrid strengthening of short reinforced concrete column elements under eccentric compression

Repair of Fire-Damaged Reinforced Concrete Members with Axial Load: A Review

RC columns longitudinally strengthened via novel EBRIOG technique

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